libby



6 Sheets-Sheet 1.

. pigs I (No Model.)

0. L. LIBBY. TURRET LATHE,

Patented July 2,

(No Model.) 6 Sheets-Sheet 2. 0. L. LIBBY.

. WEBB-1? LATHE. i No. 406,413. Patented July 2,1889

(No Model.) e Sheets-Sheet 3.

0.11. LIBBY. f

TURBBT LATHE. v No. 406,413. Patented July 2, 1889.

(No Model.) Y

Y C. LLLIBBY.

TURRBT LATHE. No. 406,413. Patented July 2, 188 9 (No Model.)

' 6 Sheets-Sheet 5. G. L. LIBBY. TURRET LATHE.

No. 406,413. Patented July 2, 1889 IIILLll I dmwm/ur I 6 SheetsSheet 6. G L I TURRET LATHE (No Model.)

Patented July 2, 1889.

U ITED STATES PATENT EErcE.

CHARLES LEON LIBBY, E BRIDGEPORT, CONNECTICUT, ASSIGNOR TO EDWARD P. BULLARD, or SAME PLACE.

TU RRET- LAT H E.

SPECIFICATION forming part of Letters Patent No. 406,413, dated July 2, 1889. Applieationfiled February 16, 1889. I Serial No. 300,133- (No model.)

To all whom it may cancern..-

Beit known that I, CHARLES LEON LIBBY, a citizen of the United States, residing at Bridgeport, in the county of Fair-field and State of Connecticut, have invented certain new and useful Improvements in Turret Lathes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appe'rtains to make and use the same.

My invention relates to certain new and useful improvements in turret lathes, but more particularly to the turret and the reciprocating carriage upon which said turret is mounted and adapted to rotate, and to certain means for releasing, turning, and locking said turret and for governing the movement of the carriage. I

l-Ieretofore in turret-lathes it has been nec- ,cssary that the carriage should make its full baekunud stroke before revolving, and this whether-operating upon long or short WOlL It is therefore the object of my invention, first, to provide means whereby the length of travel of the carriage and the point of revolution of the turret may be predetermined;

' second, to furnish, in connection with the variable-s'troke feature, simple and cfiective devices for unlocking,rotating, and locking the turret at the end of its backward movement, so that a new tool may be brought into line with the chuck and there retained, and, third, to afford means whereby the rotating mechanism, if desired, may be restrained from operation, so that one tool is continuously employed; and with these ends in view my invention consists'in the construction and ar 'a-ngement of the co-operating mechanical elements, whereby the objects hereinbcfore set forth are attaincd.

In order that those skilled in the art to which my invention app'crtains may more fully understand my improved machine, I will describe the same in detail, reference being had to the accompanyingdrawings, which form a part of this specification, and in which- Figure 1 is a plan view of the carriage and turret; Fig. 2, a rear end elevation; Fig. 3, a

longitudinal section at the line am: of Fig. 1; Fig. 4, a detail transverse section through the turret, carriage, and ways; Fig. 5, a detail plan showing the unlocking device; Fig. 6, a detail side elevation of the same; Fig. 7, a rear side elevation showing the automatic feed for the carriage.

Sin\ilar'reference-numbers denote the same parts in all the figures of the drawings.

Us the frame of the machine, which upon one end (not shown) mayhave any suitable revoluble head and chuck and such other parts as are necessary for a complete lathe. Upon the other end of said lathe are formed ways 2, upon which a movable base 3 is mounted, and may be adjusted toward and from the chuck, so that work of various lengths may be accommodated. The adjust.- lncnt of the bed-piece is effected by means of downwardly-projecting bracket 40, having therein (see Figs. 1 and 2) a journaled pinion 41, having an actuating-crank 42. The pinion. meshes with a rack 43 on the under side of the frame. By turning this crank the bed may be moved upon its ways. Upon ways 4,

which are formed upou this bed-piece, is

mounted the turret-carriage 5.

r; is the turret, preferably hexagonal in.

shape and provided with a tool-holding aperture 7 in each of its faces.- Said turret is pivoted and adapted to rotate upon a central vertical shaft 8. In the bottom face of the turret is a series of locking-recesses 9,0ne beneath each tool-holding aperture, and projecting downward from said bottom face into an annular recess in the topof the carriage are studs 10, each otl which is preferentially furnished with a roll or collar 11 upon its extremity.

A rack 12 extends longitudinally of the turret-carriage, and is engaged by a pinion'lfi upon a transverse shaft13,which is journaled in the base, and has upon one end a handwheel 14:, whereby the shaft may be revolved and the carriage caused to travel forward or backward. The carriage may, however, be caused to feed automatically by means of mechani m which,-though forming no essential part of my present invention, I wilhnow describe. 33 is a shaft ext-ended along the side of the machine and driven from any suit" able source of power, as a belt and pulley. Upon a bracket 34, depending from the earriage, is a sleeve and gear 35, turning in said bracket and splined to the shaft 313. This gear, as will be readily understood, will receive rotary motion from the shaft, and may also move longitudinally thereon. t engages a gear 36 on a short shaft 37, also mounted in the bracket, and the shaft 37 carries on its end a spiral pinion 15. This pinion aetuates a spur-gear 38, journaled in the bracket, and a pinion on said spur-gear turns a gear 39, which is fast upon the transverse shaft 13. By the means heretofore set: forth, and which are particularly shown at Fig. 7, the travel of the carriage maybe effected without the use of the hand-wheel.

Mounted in the carriage beneath the turretisa locking-bolt16,whose end is conformed to the locking-recesses in. the turret, and is adapted normally to be engaged with one of them. (See Figs. 3 and This bolt is mounted in a socket 17, and isupheld by a spring 18. It has upon either side trunnions 19, which project outwardly through. slots in the socket,

In the central ine of the carriage, and sliding upon ways in tl1ebase,is a block 2!),which at its lower end is threaded upon a screw 21, whereby it may be moved along its ways nearer to or farther from the end of the bed. In a recess in this block is hinged, as upon a pin 22, ayoke 23, which is normally retained in the position shown at Fig. 6 by a spring, as 2%. This yoke has at its top portion two inwardlypr0jecting flanges 25, wedgc'shaped in longitudinal section. (See Figs. 4, 5, and (3.) The purpose of this yoke and the wed geshapcd flanges thereon is to withdraw the lockingbolt, as will hereinafter appear. Upon the block 20, a little ahead of the yoke just described and in line with one of the downwardly-projecting studs on the turret, (see Fig. 4,) is a pawl B pivoted to said block. It cannot turn past the perpendicular in one direction by reason of its abutment againstthe block, but in the other it may turn down against the pull of the spring 277' In the top of the carriage, beneath the turret, is a slot 28, cut through into the annular groove in which the studs on the turret travel, and this slot is in line with the pawl just de scribed, so that when the slot comes over the pawl the latter may be raised by its spring, so that its point will enter therein and on gage one of the studs, as hereinafter will be explained.

29 is a coveuplate arranged to slide longitudinally just beneath the floor of the carriage and to cover or uncover the slot with itsend, as may be required, so that the pawl may freely enter the slot or may be debarred entirely. This corcnplate is actuated by a small lever 30 at the rear end of the ear-- riage, and said. lever is provided with any suitable detent or locking; device, asa springloa he actuated bolt engaging a. notched plate 3], which serves to retain the plate in either position over I he slot or clear of it.

The operatitm of mymaehine is as follows: The carriage is moved ftn'ward until the tool in ppm-a tire position has acted upon the work, and the carriage is then reversed and drawn backward by the hand-wheel. "When it has receded a sutlieient distance to allow the tool to properly clear the work, the trunnions on the locking'bolt slide under the wedgeshaped flanges of the yoke, and said bolt, as the carriage recedes still farther, is by said flanges withdrawn out; of the lockthe turret is thereby left free to turn upon its axis. fit the moment of the complete withdrawal of the locking-bolt the pawl has come opposite the slot which opens int-oyhe annular recess in the carriage, and its end has been lifted into said recess by the spring. Said end then engages one of the rollerheaded studs, and by the still further backward increment of the carriage turns the of said stud. li henithisturning is completed, the locking-bolt, trunnions having meanwhile passed the wed ges on the yoke, the locking-bolt is raised by its spring into on gagement; with the next loeking-reeess moved forward again, the trunnions, en gaging the upper faces of the wedgeshaped projections upon the yoke, ride over the same freely without withdrawal, the yoke meanwhile turning down ward upon its h inge and against its spring. The turret-pawl also is turned down against the pull of its spring, and the carriage rides freely over it during all of its backward movement and for a portion of its forward movement until the slot in the carriage again comes over the pawl, when the latter is raised into said slot to turn the turret.

ll'hen operating the turret for the use of successive tools, as above stated, the sliding, cover-plate is entirely withdrawn from over the slotin. which the turning-pawl acts. If, however, it. is desired to use one face only of the turret and to use that face over and over again, the cover-plate is, by means of its lever, projected forward, so as to cover the slot. in that case the pawl is prevented from entering the slot and is continuously re tained turned downward againnt its spring, and tho locking-bolt, while withdrawn from engagement byt'he wedges ateaeh backward movement of tho'earriage, springs back into the same rot-earns soon as it has passed the hinged yoke.

iy means of its screw the block on which the pawl and the yoke are mounted may be moved along relative to the base, so that the turret; may be unlocked and turned at; any desired distance from the forward limit of movement of the carriage.

l claiml. 'lho combination, in a machine of the carriage one-sixth of a revolution by means ll 'hen the carriage is big-recess in which it hasbeen engaged, and

character described, with the base, the-carriage, means for moving the same, and the revoluble turretmounted thereon, of the locking-bolt engaging said turret, the movable block arranged beneath said carriage, a hinged wedge mounted upon said block in the path of said locking-bolt, and a. pawl hinged upon said block and adapted to engage and turn the g as specified. I

2. The combination, in a machine of the character described, with the base having ways formed therein, of the-carriage mounted on the ways and means for moving it theresaid turret, substantially on, the rotatable turret upon said carriage, studs projecting downward from the turret,

riage, the turret mounted and adapted to turn thereon, and the locking-bo1t,of the block mounted in ways beneath the carriage, a screw'for varying the position ofsaid block lengthwise of the machine, the yoke hinged upon said block and provided with wedges located in the path of the locking-bolt, the spring-actuated pawl pivoted upon the block just forward of the yoke, and the studs upon the turret, wherewith the said pawl is adapted to engage in rotation, substantially as set forth. I

4. The combination, with the turret and the studs upon'the lower surface thereof, of the pawl pivoted to a stationary part of the lathe and adapted to engage and turn the studs seriat'im, the sliding carriage supporting the turret and having a slot through which the pawl is raised into engagement with the studs, and a sliding plate and means for actuating the same, whereby the slot may be opened for the reception of the pawl orclosed as against entrance of the-same, substantially as specified.

. 5 In a machine of the character'described, the combination, with the base and carriage, of the turret, its studs and the locking-bolt, the movable. block, the means thereon for withdrawing the locking-bolt, the pawl whereby the studs may be engaged, and the coverplate and means for moving the same over or away from the slot in the carriage beneaththe studs, substantially as specified, ul

In testimony whereof I aflix my signature in presence of two witnesses.

CHARLES LEON LIBBY. Witnesses:

"firms. E. HADLEY,

. A FPLUBULLARD. 

